just got another car (1995 integra RS), and im gonna slap on a B16/18 head on it sometime down the line. i was just wondering, since the 95 is a obd1, when i add the vtec head, do i gotta swap to a obd2 and go through the trouble? or just get a different ecu like a p72 or p28? also, the rs didn't come with a/c, so is it possible to drop in a compressor, do some wiring and have a working a/c? if so, how much? thanks.